








hr = h;
hl = h;
ht = h;
hb = h;
dxp=h;
dyp=h;
dxU = h;
dyV = h;
dyU = h;
dxV = h;
DVu = dxU * dyU;
DVv = dxV * dyV;

        % dxur,dxul,dyut,dyub,dxc,DVu
        % dxvr,dxvl,dyvr,dyvl,dyc,DVv
dxur = h;
dxul = h;
dyut = h;
dyub = h;
dxvr = h;
dxvl = h;
dyvt = h;
dyvb = h;
dyuc = h;
dxuc = h;
DVu = h*h;
DVv = h*h;

dyvc = h;
dxvc = h;